The symptoms, virion morphologies and insect vectors of rice yellow stunt disease occurred in mainland China and riee transitory yellowing disease found in Taiwan are very similar or identical as deseribed in the previous reports, therefore they are putatively regarded as the same. But serological comparison between the causative viruses of two diseases has not been done so far. In this paper we report on the reactions of crude Rice Yellow Stunt Virus (RYSV) preparations extracted from diseased rice plants ...